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/* Please visit the URL below for more information: */
/*   https://shd101wyy.github.io/markdown-preview-enhanced/#/customize-css */
 
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    <body for="html-export">
      <div class="mume markdown-preview   ">
      <h1 class="mume-header" id="p-aligncenter%E5%9B%BE%E7%89%87%E4%B8%8A%E4%BC%A0%E9%A2%84%E8%A7%88p"><p align="center">&#x56FE;&#x7247;&#x4E0A;&#x4F20;&#x9884;&#x89C8;</p></h1>

<h2 class="mume-header" id="%E6%A0%B8%E5%BF%83api-filereader-%E6%B5%8F%E8%A7%88%E5%99%A8">&#x6838;&#x5FC3;API &#xFF1A; FileReader (&#x6D4F;&#x89C8;&#x5668;)</h2>

<ul>
<li>IE 10/11 partial support</li>
<li><a href="https://caniuse.com/#search=FileReader">caniuse</a></li>
<li><a href="https://developer.mozilla.org/zh-CN/docs/Web/API/FileReader">MDN&#x4ECB;&#x7ECD;</a></li>
</ul>
<h2 class="mume-header" id="%E5%B1%9E%E6%80%A7">&#x5C5E;&#x6027;</h2>

<ul>
<li>FileReader.error &#x53EA;&#x8BFB;</li>
<li>FileReader.readyState &#x53EA;&#x8BFB;</li>
</ul>
<table>
<thead>
<tr>
<th>&#x5E38;&#x91CF;&#x540D;</th>
<th>&#x503C;</th>
<th>&#x63CF;&#x8FF0;</th>
</tr>
</thead>
<tbody>
<tr>
<td>EMPTY</td>
<td>0</td>
<td>&#x8FD8;&#x6CA1;&#x6709;&#x52A0;&#x8F7D;&#x4EFB;&#x4F55;&#x6570;&#x636E;.</td>
</tr>
<tr>
<td>LOADING</td>
<td>1</td>
<td>&#x6570;&#x636E;&#x6B63;&#x5728;&#x88AB;&#x52A0;&#x8F7D;.</td>
</tr>
<tr>
<td>DONE</td>
<td>2</td>
<td>&#x5DF2;&#x5B8C;&#x6210;&#x5168;&#x90E8;&#x7684;&#x8BFB;&#x53D6;&#x8BF7;&#x6C42;.</td>
</tr>
</tbody>
</table>
<h2 class="mume-header" id="%E4%BA%8B%E4%BB%B6">&#x4E8B;&#x4EF6;</h2>

<ul>
<li>FileReader.onloadstart
<ul>
<li>&#x8BE5;&#x4E8B;&#x4EF6;&#x5728;&#x8BFB;&#x53D6;&#x64CD;&#x4F5C;&#x5F00;&#x59CB;&#x65F6;&#x89E6;&#x53D1;&#x3002;</li>
</ul>
</li>
<li>FileReader.onprogress
<ul>
<li>&#x8BE5;&#x4E8B;&#x4EF6;&#x5728;&#x8BFB;&#x53D6;Blob&#x65F6;&#x89E6;&#x53D1;&#x3002;</li>
</ul>
</li>
<li>FileReader.onloadend
<ul>
<li>&#x8BE5;&#x4E8B;&#x4EF6;&#x5728;&#x8BFB;&#x53D6;&#x64CD;&#x4F5C;&#x7ED3;&#x675F;&#x65F6;&#xFF08;&#x8981;&#x4E48;&#x6210;&#x529F;&#xFF0C;&#x8981;&#x4E48;&#x5931;&#x8D25;&#xFF09;&#x89E6;&#x53D1;&#x3002;</li>
</ul>
</li>
<li>FileReader.onload
<ul>
<li>&#x8BE5;&#x4E8B;&#x4EF6;&#x5728;&#x8BFB;&#x53D6;&#x64CD;&#x4F5C;&#x5B8C;&#x6210;&#x65F6;&#x89E6;&#x53D1;&#x3002;</li>
</ul>
</li>
<li>FileReader.onerror
<ul>
<li>&#x8BE5;&#x4E8B;&#x4EF6;&#x5728;&#x8BFB;&#x53D6;&#x64CD;&#x4F5C;&#x53D1;&#x751F;&#x9519;&#x8BEF;&#x65F6;&#x89E6;&#x53D1;&#x3002;</li>
</ul>
</li>
<li>FileReader.onabort
<ul>
<li>&#x8BE5;&#x4E8B;&#x4EF6;&#x5728;&#x8BFB;&#x53D6;&#x64CD;&#x4F5C;&#x88AB;&#x4E2D;&#x65AD;&#x65F6;&#x89E6;&#x53D1;&#x3002;</li>
</ul>
</li>
</ul>
<h2 class="mume-header" id="%E6%96%B9%E6%B3%95">&#x65B9;&#x6CD5;</h2>

<ul>
<li>FileReader.abort()
<ul>
<li>&#x4E2D;&#x6B62;&#x8BFB;&#x53D6;&#x64CD;&#x4F5C;&#x3002;&#x5728;&#x8FD4;&#x56DE;&#x65F6;&#xFF0C;readyState&#x5C5E;&#x6027;&#x4E3A;DONE&#x3002;</li>
</ul>
</li>
<li>FileReader.readAsArrayBuffer()
<ul>
<li>&#x4E00;&#x65E6;&#x5B8C;&#x6210;, result &#x5C5E;&#x6027;&#x4E2D;&#x4FDD;&#x5B58;&#x7684;&#x5C06;&#x662F;&#x88AB;&#x8BFB;&#x53D6;&#x6587;&#x4EF6;&#x7684; ArrayBuffer &#x6570;&#x636E;&#x5BF9;&#x8C61;.</li>
</ul>
</li>
<li>FileReader.readAsBinaryString()
<ul>
<li>&#x4E00;&#x65E6;&#x5B8C;&#x6210;&#xFF0C;result&#x5C5E;&#x6027;&#x4E2D;&#x5C06;&#x5305;&#x542B;&#x6240;&#x8BFB;&#x53D6;&#x6587;&#x4EF6;&#x7684;&#x539F;&#x59CB;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#x3002;</li>
</ul>
</li>
<li>FileReader.readAsDataURL()  (&#x56FE;&#x7247;&#x8F6C; base64)
<ul>
<li>&#x4E00;&#x65E6;&#x5B8C;&#x6210;&#xFF0C;result&#x5C5E;&#x6027;&#x4E2D;&#x5C06;&#x5305;&#x542B;&#x4E00;&#x4E2A;data: URL&#x683C;&#x5F0F;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x4EE5;&#x8868;&#x793A;&#x6240;&#x8BFB;&#x53D6;&#x6587;&#x4EF6;&#x7684;&#x5185;&#x5BB9;&#x3002;</li>
</ul>
</li>
<li>FileReader.readAsText()
<ul>
<li>&#x4E00;&#x65E6;&#x5B8C;&#x6210;&#xFF0C;result&#x5C5E;&#x6027;&#x4E2D;&#x5C06;&#x5305;&#x542B;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#x4EE5;&#x8868;&#x793A;&#x6240;&#x8BFB;&#x53D6;&#x7684;&#x6587;&#x4EF6;&#x5185;&#x5BB9;&#x3002;</li>
</ul>
</li>
</ul>
<h2 class="mume-header" id="demo">demo</h2>

<pre data-role="codeBlock" data-info="html {.line-numbers}" class="language-html line-numbers"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>file<span class="token punctuation">&quot;</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>file<span class="token punctuation">&quot;</span></span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>file<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span><span class="token punctuation">&quot;</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span><span class="token punctuation">&quot;</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>preview<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></pre><pre data-role="codeBlock" data-info="javascript {.line-numbers}" class="language-javascript line-numbers"><span class="token function">$</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">&apos;#file&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">&apos;change&apos;</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token comment">// console.log(e);</span>
      <span class="token comment">// console.log(e.target.files);</span>
      <span class="token comment">// console.log(e.target.files[0]);</span>
      
      <span class="token keyword">var</span> reader <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">FileReader</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token comment">// reader.readAsDataURL(e.target.files[0]);</span>
      <span class="token comment">// reader.readAsBinaryString(e.target.files[0]);</span>
      reader<span class="token punctuation">.</span><span class="token function">readAsText</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span>target<span class="token punctuation">.</span>files<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
      reader<span class="token punctuation">.</span><span class="token function-variable function">onload</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span>target<span class="token punctuation">.</span>result<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">&apos;.preview&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">attr</span><span class="token punctuation">(</span><span class="token string">&apos;src&apos;</span><span class="token punctuation">,</span>e<span class="token punctuation">.</span>target<span class="token punctuation">.</span>result<span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></pre>
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<li><a href="#p-aligncenter%E5%9B%BE%E7%89%87%E4%B8%8A%E4%BC%A0%E9%A2%84%E8%A7%88p">&#x56FE;&#x7247;&#x4E0A;&#x4F20;&#x9884;&#x89C8;</a>
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<li><a href="#%E6%A0%B8%E5%BF%83api-filereader-%E6%B5%8F%E8%A7%88%E5%99%A8">&#x6838;&#x5FC3;API &#xFF1A; FileReader (&#x6D4F;&#x89C8;&#x5668;)</a></li>
<li><a href="#%E5%B1%9E%E6%80%A7">&#x5C5E;&#x6027;</a></li>
<li><a href="#%E4%BA%8B%E4%BB%B6">&#x4E8B;&#x4EF6;</a></li>
<li><a href="#%E6%96%B9%E6%B3%95">&#x65B9;&#x6CD5;</a></li>
<li><a href="#demo">demo</a></li>
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